5.5

CVE-2024-40931: linux Use of Uninitialized Resource

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2024-40931DEBIAN-CVE-2024-40931
Published 12-07-2024Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2024-40931 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.26%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 21
DLA-4008-1DSA-5730-1DSA-5731-1RHSA-2024:7000RHSA-2024:7001RHSA-2024:8617

Timeline

  1. 12-07-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: ensure snd_una is properly initialized on connect This is strictly related to commit fb7a0d334894 ("mptcp: ensure snd_nxt is properly initialized on connect"). It turns out that syzkaller can trigger the retransmit after fallback and before processing any other incoming packet - so that snd_una is still left uninitialized. Address the issue explicitly initializing snd_una together with snd_nxt and write_seq.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu116 products
  • linux< 5.15.0-121.131 | < 6.8.0-44.44
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1069.75 | < 6.8.0-1015.16
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < 208cd22ef5e57f82d38ec11c1a1703f9401d6dde | ≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < 7b9c7fc8600b64a86e4b47b2d190bba380267726 | ≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < f03c46eabb3a67bd2993e237ab5517f00a5f1813 | ≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < f1f0a46f8bb8890b90ab7194f0a0c8fe2a3fb57f | ≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < ef473bf1dd7e8dd08bcc04b9e2d1bfed69a0a7ce | ≥ 8fd738049ac3d67a937d36577763b47180aae1ad, < 8031b58c3a9b1db3ef68b3bd749fbee2e1e1aaa3 | 5.9
  • linux_kernel≥ 5.9, < 5.10.221 | ≥ 5.11, < 5.15.162 | ≥ 5.16, < 6.1.95 | ≥ 6.2, < 6.6.35 | ≥ 6.7, < 6.9.6 | 6.10:rc1 | 6.10:rc2 | 6.10:rc3
Debian1 product
  • linux< 6.1.99-1 | < 6.9.7-1

3 vendors · 119 products

References

24 links
Show all 24 references